OVA Ryoko was a coldblooded killer, with no remorse for her crimes. She also enjoyed sex with strangers and getting hammered.

OVA Ayeka was willing to lay waste to an entire town, just to ‘avenge her brother’. And enjoys torturing people. Like when she made Ryoko CUM from electric shock torture and whips Tenchi til he addresses her as ‘queen’.

OVA Washu, Tsunami & Tokimi are ‘gods’, who conduct experiments on the beings/universes they’ve created, in hopes of discovering a higher dimensional being. To them the galaxies they’ve created are little different than an animal laboratory, with them the scientists conducting tests.

OVA Mihoshi was originally planned to be an assassin, but that was changed when the script for EP4 was finalized.

OVA Sasami enjoys pitting girl against girl, then lavishing in their misfortune. Like when she tricked the girls into believing the stories in some old shoujo manga would work in netting Tenchi.

As is, the list can be remade in any way you wish, you just discard the items you don’t want. Series names make all the related ones pop in the heads easier, but they have to be brought forth as voting items first anyway, so it’s probable your restrictions wouldn’t make it more interesting, just reduce the number of options. And series environments define the plausibility or conspicuousness of certain traits as well, so why throw that out.